1. What is Discharge in Well under Constant Depression Head?

Discharge in a well under constant depression head refers to the rate of flow of water from a well when the depression head (the difference between the static water level and the pumping water level) remains constant. This is an important parameter in hydrogeology and well hydraulics.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Q \) — Discharge (m³/s)
• \( K \) — Constant depending on the soil at the base of the well
• \( H \) — Constant depression head in the well (m)

Explanation: The formula calculates the discharge rate by multiplying the soil constant with the constant depression head maintained in the well.

3. Importance of Discharge Calculation

Details: Accurate discharge calculation is crucial for determining well yield, designing pumping systems, assessing aquifer characteristics, and managing groundwater resources effectively.

4. Using the Calculator

Tips: Enter the soil constant value and the constant depression head value. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What factors affect the constant K value?
A: The constant K depends on soil permeability, well construction, aquifer characteristics, and the specific geological conditions at the well base.

Q2: How is constant depression head maintained?
A: Constant depression head is typically maintained through controlled pumping rates or using specialized equipment that regulates the water level during testing.

Q3: What are typical discharge rates for wells?
A: Discharge rates vary widely depending on aquifer characteristics, ranging from less than 1 m³/h for low-yield wells to over 100 m³/h for high-yield wells.

Q4: When should this calculation be used?
A: This calculation is particularly useful for preliminary well yield assessment and for understanding the relationship between depression head and discharge rate.

Q5: Are there limitations to this simple formula?
A: Yes, this simplified formula assumes ideal conditions. More complex equations like Theis or Jacob methods may be needed for detailed aquifer analysis.